ASTM D3375-1995a(2007) 混合粒子层中离子交换材料的柱容量的标准试验方法

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【英文标准名称】:StandardTestMethodforColumnCapacityofParticulateMixedBedIonExchangeMaterials
【原文标准名称】:混合粒子层中离子交换材料的柱容量的标准试验方法
【标准号】:ASTMD3375-1995a(2007)
【标准状态】:现行
【国别】:美国
【发布日期】:1995
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D19.08
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:columncapacity;conductivity;ionexchange;mixedbed;Columncapacity;Conductanceandconductivity(electrical)water;Deionization;Ionexchangeresins;Mixed-bedion-exchangeresins;Performancewateranalysisequipment
【摘要】:Thistestmethodcanbeusedtoevaluateunusedmixedbedionexchangematerialsforconformancetospecifications.Whenarepresentativesampleofthemixedbedcanbeobtainedfromanoperatingunit,thistestmethodcanbeusedtoevaluatetheregenerationefficiencybycomparisonwiththesamedataobtainedwithnewmaterialfromthesamemanufacturedlots,orretainedsamplesofthein-placeproducts.Thistestmethodprovidesforthecalculationofcapacityintermsofthevolumeofwatertreatedtoaconductivityendpoint.Thetestmethodaswrittenassumesthatthecationexchangematerialhasbeenregeneratedtothehydrogenformwithacidandtheanionexchangematerialhasbeenregeneratedwithalkalitothehydroxideorfree-baseform.Incertainapplicationsacationexchangematerialinthepotassium,ammonium,orothermonovalentformmaybeencountered.SuchmaterialsmaybetestedfollowingthisprocedureusingTestWaterA(TestMethodsD1782)astheinfluentandsubstitutingthehardnessendpoint(TestMethodsD1782)fortheendpointsprescribedherein.Inmostcasestheproducttestedwillbeproperlymixedandwillcontainthecorrectproportionsofanionandcationexchangematerials.However,ifthepHaswellastheconductivityoftheeffluentismeasured,thetestmethodwillindicatewhichofthecomponentsispresentinexcess;anacideffluentatbreakthroughindicatinganexcessofregeneratedcationexchangegroupsandanalkalineeffluentanexcessofregeneratedanionexchangegroups.Insuchcasesthevolumesofthetwocomponentsobtainedinthefinalbackwashwillindicatewhetherthisimbalancearisesfromimproperregenerationorfromanimproperratioofthetwocomponents.Itshouldbenoted,however,thatnotallunitsarechargedwithabalancedratioofanion-exchangingandcation-exchanginggroups.Hence,whereverpossible,afieldsampleshouldbeevaluatedincomparisonwitharetainedsampleoftheoriginalcharge.Thistestmethodprovidesforthecalculationofcapacityoneitherawetweightbasisoravolumebasis.Althoughsuchmaterialsarenormallyboughtandsoldintermsofcubicfeet,theyareactuallypackagedinwetpounds.Therefore,itisthecapacityonawetweightbasisthatisdirectlycorrelatabletotheamountofmaterialinagivenshipment.Calculationofavolumecapacityisbasedontheexhausted,separatedvolumeofthecomponentsafterbackwashingandresettlingthebed.Thisvolumeischosenbecauseitisdifficult,ifnotimpossible,topackasampleofregeneratedmixedbedmaterialinasmall-diametercolumnreproducibly.Thistestmethodmaybeusedtotestmixedbedresincartridges.Insuchcasestheflowrateoftestwaterandthefrequencyofsamplingmustbevariedtocompensatefortheapproximatevolumeofresininthetestsample.Thetestaswrittenassumesaresinvolumeofapproximately330mL.1.1Thistestmethodcoversthedeterminationoftheperformanceofparticulatemixedbedionexchangematerialsintheregeneratedformwhenusedfordeionization.Itisintendedforuseintestingunusedmixedbedmaterialsandsamplesofregeneratedmixedbedsfromoperatingunits.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:G73
【国际标准分类号】:71_100_40
【页数】:4P.;A4
【正文语种】:英语